Structural and compositional modification of a barium boroaluminosilicate glass surface by thermal poling

Nicholas J. Smith, Carlo G. Pantano

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In addition to inducing second-order nonlinear properties, significant structural and compositional alteration can be imparted to glass surfaces during the process of thermal poling. In this work, we focus on how thermal poling affects a structurally complex, nominally alkali-free boroaluminosilicate display glass composition. We provide evidence for electrolysis of the glass network, characterized by the migration of both cations (Ba2+, Na+) and anions (O-, F-) towards opposing electrode interfaces. This process results in oxidation of the positively biased electrode and forms a network-former rich, modifier-depleted glass surface layer adjacent to the anodic interface. The modified glass layer thickness is qualitatively correlated to the oxidation resistance of the electrode material, while extrinsic ions such as H+/H3O+ at not found in the depletion layer to compensate for the migration of modifier cations out of the region. Rather, FTIR spectroscopy suggests a local restructuring of the B2O3-Al2O3-SiO2 network species to accommodate the charge imbalance created by the exodus of network-modifying cations, specifically the conversion of tetrahedral B(4) to trigonal B(3) as Ba or Na ions are removed from B-related sites in the parent network. The resultant poling-induced depletion layer exhibits enhanced hydrolytic resistance under acidic conditions, and the IR spectra are substantially unlike those produced by acid leaching the same glass.

Original languageEnglish (US)
Pages (from-to)529-543
Number of pages15
JournalApplied Physics A: Materials Science and Processing
Volume116
Issue number2
DOIs
StatePublished - Jan 1 2014

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Barium
Glass
Cations
Positive ions
Electrodes
Ions
Oxidation resistance
Alkalies
Electrolysis
Leaching
Anions
Hot Temperature
barium glass filler
Structural properties
Negative ions
Display devices
Spectroscopy
Oxidation
Acids
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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abstract = "In addition to inducing second-order nonlinear properties, significant structural and compositional alteration can be imparted to glass surfaces during the process of thermal poling. In this work, we focus on how thermal poling affects a structurally complex, nominally alkali-free boroaluminosilicate display glass composition. We provide evidence for electrolysis of the glass network, characterized by the migration of both cations (Ba2+, Na+) and anions (O-, F-) towards opposing electrode interfaces. This process results in oxidation of the positively biased electrode and forms a network-former rich, modifier-depleted glass surface layer adjacent to the anodic interface. The modified glass layer thickness is qualitatively correlated to the oxidation resistance of the electrode material, while extrinsic ions such as H+/H3O+ at not found in the depletion layer to compensate for the migration of modifier cations out of the region. Rather, FTIR spectroscopy suggests a local restructuring of the B2O3-Al2O3-SiO2 network species to accommodate the charge imbalance created by the exodus of network-modifying cations, specifically the conversion of tetrahedral B(4) to trigonal B(3) as Ba or Na ions are removed from B-related sites in the parent network. The resultant poling-induced depletion layer exhibits enhanced hydrolytic resistance under acidic conditions, and the IR spectra are substantially unlike those produced by acid leaching the same glass.",
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Structural and compositional modification of a barium boroaluminosilicate glass surface by thermal poling. / Smith, Nicholas J.; Pantano, Carlo G.

In: Applied Physics A: Materials Science and Processing, Vol. 116, No. 2, 01.01.2014, p. 529-543.

Research output: Contribution to journalArticle

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